World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew

Alnus incana var. occidentalis (Dippel) Hitchc. in C.L.Hitchcock & al., Vasc. Pl. Pacif. N. W. 2: 73 (1964).

This name is a synonym.

Homotypic Names:
Accepted Name:	Alnus incana subsp. tenuifolia (Nutt.) Breitung, Amer. Midl. Naturalist 58: 25 (1957).
Family:	Betulaceae
* Alnus occidentalis Dippel, Handb. Laubholzk. 2: 158 (1891). Alnus tenuifolia var. occidentalis (Dippel) Callier in C.K.Schneider, Handb. Laubholzk. 1: 133 (1904). * Basionym/Replaced Synonym
Original Compiler:	R.Govaerts